Summary

For the kink meme, where most such things come from:

Alphas and Omegas are forced to breed by the government. Omega Sherlock goes through his first heat and is bred by a gentle Alpha he doesn't remember. He's pregnant and bonded at a young age and it seems like his Alpha has no intention of finding him afterwards.

Years later, he runs into John Watson. He seems vaguely familiar, but Sherlock can't place it.